/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Times New Roman", "SimSun", "宋体", serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 空页眉样式 */
.exam-header {
    height: 20px;
    background-color: transparent;
}

/* 考试主体样式 */
.exam-container {
    max-width: 1200px; /* 原800px的1.5倍 */
    margin: 30px auto;
    background-color: white;
    padding: 45px; /* 按比例增加内边距 */
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    text-align: center;
}

/* 题目样式调整 */
.question-item {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid #eee;
    text-align: center;
}

.question-title {
    font-size: 1.5rem;
    margin-bottom: 25px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.question-number {
    margin-right: 12px;
    font-size: 1.5rem;
}

/* 选项样式调整 */
.question-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 75px;
}

.option-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    background-color: #f8f9fa;
    border-radius: 6px;
    font-size: 1.15rem;
    transition: all 0.2s ease;
}

.option-item:hover {
    background-color: #e9f0f8;
}

.option-letter {
    font-weight: bold;
    margin-right: 12px;
    font-size: 1.15rem;
}

/* 按钮样式 */
.btn-submit {
    padding: 12px 30px;
    font-size: 1.15rem;
    background-color: #1a56a1;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 40px;
    transition: all 0.2s ease;
}

.btn-submit:hover {
    background-color: #0d47a1;
}

/* 反馈信息 */
.answer-feedback {
    margin-top: 20px;
    font-size: 1.15rem;
    font-weight: bold;
    min-height: 25px;
}

/* 标题样式 */
.exam-title {
    font-size: 2rem;
    margin-bottom: 40px;
    color: #1a56a1;
}

/* 响应式设计 */
@media (max-width: 1300px) {
    .exam-container {
        width: 95%;
        max-width: none;
    }
    
    .question-options {
        padding: 0 50px;
    }
}

@media (max-width: 900px) {
    .question-options {
        grid-template-columns: 1fr;
        padding: 0 30px;
    }
    
    .exam-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    .exam-container {
        padding: 30px;
    }
    
    .question-title {
        font-size: 1.3rem;
    }
    
    .option-item {
        font-size: 1rem;
    }
}